Iris pseudacorus

Plant type: herbaceous perennial
Height: 3- 6 feet
Cultural Requirements: full to partial sun, high moisture
Leaves: sheath leaves
Disease and Insects: none
Hardiness: zones 4- 9
spacing: 36- 48 inches

http://www.dungevalley.co.uk/Iris%20pseudacorus%20%27Variegata%27.jpg